You just found the perfect I2C sensor, and you want to wire up two or
three or more of them to your Arduino when you realize "Uh oh, this
chip has a fixed I2C address, and from what I know about I2C, you
cannot have two devices with the same address on the same SDA/SCL
pins!" Are you out of luck? You would be, if you didn't have this
ultra-cool TCA9548A 1-to-8 I2C multiplexer!
Finally, a way to get up to 8 same-address I2C devices hooked up to
one microcontroller - this multiplexer acts as a gatekeeper, shuttling
the commands to the selected set of I2C pins with your command.
Using it is fairly straight-forward: the multiplexer itself is on I2C
address 0x70 (but can be adjusted from 0x70 to 0x77) and you simply
write a single byte with the desired multiplexed output number to that
port, and bam - any future I2C packets will get sent to that port. In
theory, you could have 8 of these multiplexers on each of 0x70-0x77
addresses in order to control 64 of the same-I2C-addressed-part.
Like all Adafruit breakouts, we put this nice chip on a breakout for
you so you can use it on a breadboard with capacitors, and pullups and
pulldowns to make usage a snap. Some header is required and once
soldered in you can plug it into a solderless-breadboard. The chip
itself is 3V and 5V compliant so you can use it with any logic level.
* Weight: 1.8g
* Selectable I2C address 0x70-0x77 … more
|Product type||Electronics module|
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Warranty 24 month Bring-in
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